Sometimes if you have a enormous file with lots of tabs, you may want to start by isolating the specific tab(s) that are causing this error message. Best of luck! Isolate The Specific Spreadsheet Tab Well, I have been in your shoes feeling the exact frustration and hopefully I can guide you through the different parts of your spreadsheet that may be housing this invalid formula reference. So after clicking OK about ten times, you've probably more than a little time trying to figure out what is causing this message to keep popping up. Well, thank you Excel for giving us a blanket, catch-all statement that is essentially telling us, 'I've found an issue with your spreadsheet, I'm not going to tell you where it is or even what type of object is causing this.but enjoy scouring the entire file! Oh, and I almost forgot, I'm going to keep reminding you about this error until it's fixed.'